slopez,
You are paying a company to help you with this process.........they should be able to answer the questions that you are having regarding the process that they are supposed to be helping you with..............make them work for that small fee of 4k
A rate freeze takes the rate that you are currently at a freezes it for a period of time.............usually 5 yrs.
A modification modifies the rate to a different one than it is currently at but in most cases not lower than your initial start rate............